离心模型试验预测复合地基沉降的精度

Accuracy of Settlement Prediction of Composite Foundation by Centrifuge Model Tests

为定量评估土工离心模型试验对复合地基的预测能力,采用离心模型试验方法对2种复合地基进行了模拟试验.通过比较模拟试验结果与现场填筑试验结果,分析了不同地基处理方式、试验方式、地基土类型等因素对离心模型预测地基沉降精度的影响.结果表明:采用准相似级配法制作加固区模型时,离心模型试验结果与现场试验结果差异明显,而采用力学(指标)相似法制作加固区模型则可有效提高离心模型试验的预测精度;此外,预测精度受地基土性质和加固方式的影响较大.

To quantitatively assess the prediction ability of geotechnical centrifuge model test for composite foundation, centrifugal model tests were carried out on two kinds of composite foundation. Through the comparison of experimental and field filling results, the factors affecting the prediction accuracy, including the type of composite foundation, test method, soil types and others, were analyzed. The results show that： the prediction accuracy of the similar grading method model is low, and the prediction accuracy of the similar mechanical parameters method can improve the prediction accuracy effectively. Furthermore, the prediction accuracy is influenced by soil characteristics and reinforcing methods.